feat: migrate ESLint to v9 flat config

- Replace .eslintrc.json with eslint.config.mjs
- Simplify configuration using @antfu/eslint-config
- Add necessary ESLint plugin dependencies
- Disable overly strict style rules
- Set package.json type to module for ESM support
- Fix ESLint disable comment format

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/components/base/icons/IconBase.tsx

@@ -2,12 +2,12 @@ import { forwardRef } from 'react'
 import { generate } from './utils'
 import type { AbstractNode } from './utils'
 
-export type IconData = {
+export interface IconData {
   name: string
   icon: AbstractNode
 }
 
-export type IconBaseProps = {
+export interface IconBaseProps {
   data: IconData
   className?: string
   onClick?: React.MouseEventHandler<SVGElement>